The problem doesn't come from the casper package. The problem is in the
grub-efi-amd64-bin package (latest version tested:2.04-1ubuntu16).
Actually, it's the file grubx64.efi inside this package
(/usr/lib/grub/x86_64-efi/monolithic/grubx64.efi).
menuentry ".. Xubuntu .... test daily" {
set isofile="/isos/focal-desktop-amd64.iso"
search --set=root --file $isofile
loopback loop $isofile
linux (loop)/casper/vmlinuz iso-scan/filename=$isofile boot=casper
noprompt quiet splash --
initrd (loop)/casper/initrd
}
menuentry ".. Xubuntu Default cd Menu" {
iso_path="/isos/focal-desktop-amd64.iso"
export iso_path
search --set=root --file $iso_path
loopback loop $iso_path
root=(loop)
configfile /boot/grub/loopback.cfg
loopback --delete loop
}
It doesn't work in 2.04 grub version. So I experienced something.
1- I downloaded the 2.02 grub-efi-amd64-bin package from here:
https://packages.ubuntu.com/disco-updates/amd64/grub-efi-amd64-bin/download
2- I opened the deb package with my archive manager
3- I extracted the file: grubx64.efi
(from /usr/lib/grub/x86_64-efi/monolithic/)
4- I launched efibootmgr in a terminal to be sure where to copy it
5- I copied it in the right folder in /boot/efi
sudo cp grubx64.efi /boot/efi/EFI/xubuntu/.
After that, both menus worked fine (in a 2.02 grub)!
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https://bugs.launchpad.net/bugs/1851311
Title:
Grub 2.04 Out of memory error, No server error
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